<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登录表单区域 -->
      <el-form label-width="0px" class="login_form" :model="form" :rules="rules" ref="loginFormRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input placeholder="请输入用户名"
                    prefix-icon="el-icon-user"
                    v-model="form.username">
          </el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input placeholder="请输入密码"
                    prefix-icon="el-icon-lock"
                    v-model="form.password"
                    type="password">
          </el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="formLogin" :plain="true">登录</el-button>
          <el-button type="info" @click="resetForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  data () {
    return {
      // 登录表单的数据绑定对象
      form: {
        username: '',
        password: ''
      },
      // 表单的验证规则对象
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 2, max: 10, message: '长度在4到10个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 4, max: 10, message: '长度在4到10个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置表单
    resetForm () {
      this.$refs.loginFormRef.resetFields()
    },
    formLogin () {
      this.$refs.loginFormRef.validate()
        .then(async resolve => {
          // 调用接口
          const { data: res } = await this.$http.post('login', this.form)
          if (res.meta.status === 200) {
            // 登录成功
            this.$message.success('登录成功')
            // 保存token
            window.sessionStorage.setItem('token', res.data.token)
            // 跳转页面
            this.$router.push('/home')
          }
        }).catch(reject => {
          // 弹出提示框
        })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container {
    position: relative;
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    position: absolute;
    top: 50%;
    left:50%;
    transform: translate(-50%,-50%);
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
  }

  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    border-shadow: 0 0 10px #ddd;
    margin-left: 50%;
    position: absolute;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img {
      border-radius: 50%;
      width: 100%;
      height: 100%;
      background-color: #eee;
    }
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
</style>
